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Shows the construction of Hoover Dam. One of the portals of the diversion tunnels is visible. Dynamite blasting is taking place in the canyon and trucks and various construction buildings are visible on the cofferdam. Also shows some...

Shows construction of Hoover Dam from the upstream side. Buildings and trucks are visible on the cofferdam. One of the portals to the diversion tunnels can be seen at lower left. The intake towers are rising...

View of Hoover Dam under construction. A portal to a diversion tunnel is visible at lower left. The power houses can be seen as well as several buildings in the lower right of the photo on the cofferdam.

View from a distance of Hoover Dam and the canyon. The upstream face, the power houses, and one of the portals to the diversion tunnels can be seen. There are buildings on the cofferdam and part of the...

This postcard shows the construction of Hoover Dam in four different stages. All views were taken from the same point looking upstream. The first image shows Black Canyon and the Colorado River at the very beginning of construction...

Panoramic view of the Hoover Dam construction site. One of the lower portals to a division tunnel can be seen. Buildings, trucks, and the cofferdam are also visible. A portion of the Colorado River is...

Panoramic view of Black Canyon and Hoover Dam under construction. Two of the portals to the diversion tunnels are visible. The face of the dam is nearing completion and the concrete pouring forms can be seen. Part...

Aerial view of Hoover Dam, Black Canyon, and the Colordo River during the construction of the dam. Two portals of the diversion tunnels are visible. There are trucks and buildings on the cofferdam. The face of the...

View of the Hoover Dam construction site in Black Canyon, showing the nearly-completed dam face and construction on the power houses in the lower cofferdam. Concrete pouring forms are seen on the tops of the power houses. Temporary buildings...

View of the Hoover Dam construction site in Black Canyon, showing the nearly-completed dam face and construction on the power houses in the lower cofferdam. Concrete pouring forms are seen on the tops of the power houses. Temporary buildings,...

View of the Hoover Dam construction site in Black Canyon, showing the nearly-completed dam face and construction on the power houses in the lower cofferdam. Concrete pouring forms are seen on the tops of the power houses. Temporary buildings, construction...

Aerial view of the Hoover Dam construction site in Black Canyon. Visible are the spillways, intake towers, dam face, diversion tunnels and construction on the power houses. Temporary buildings are seen in the cofferdam downstream of the dam face. The...